Remove `toolchain --install/--uninstall/--install-dir` #70

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Run time

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Job	Run time
ce2020 on macos-latest	21m 37s
ce2020 on ubuntu-latest	7m 2s
ce2021 on ubuntu-latest	7m 24s
ce2020 on windows-latest	24m 15s
ce2021 on windows-latest	14m 30s
	1h 14m 48s